ultra fine point sharpie
wonder under or another fusible fabric (I use batiks because the tighter weave helps prevent fraying and the color selection is close to normal dog fur)
small sharp scissors
Later I will give satin stitch instructions if you want to use that method
First find a good clear photo to use. You are looking for a photo with good lighting which shows depth and shadows. I enlarged mine on the color copier at Staples to the largest size that fit on the paper. Make sure it isn't too fuzzy because you will be tracing this! Don't worry about the background as long as it doesn't interfere with the lines for the dog.
Enlargement of picture on 8.5 X 17 inch paper. Note the light source and shadows and details, which is why I chose this shot.
Trace around all the changes in light and color on the plastic with the sharpie. Make sure that the lines are all closed with a start and finish that intersects (no loose lines all must connect). Compare this with the enlagrement.